<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form action="/form/demo1" method="post">
    <p>username:<input type="text" name="username"></p>
    <p>password:<input type="text" name="password"></p>
    <p>age:<input type="text" name="age"></p>
    <button>注册</button>
</form>
</body>
</html>